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Securities, Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available for sale, amortized cost [Abstract]
Due in one year or less	$ 84,795
Due after one through five years	23,605
Due after five through ten years	91,043
Due after ten years	71,210
Amortized cost	593,945	$ 602,114
Available for sale, fair value [Abstract]
Due in one year or less	85,107
Due after one through five years	23,963
Due after five through ten years	91,175
Due after ten years	73,212
Fair value	599,844	593,746
Held-to-maturity, amortized cost [Abstract]
Due in one year or less	517
Due after one through five years	0
Due after five through ten years	0
Due after ten years	0
Amortized cost	517	649
Held-to-maturity, fair value [Abstract]
Due in one year or less	517
Due after one through five years	0
Due after five through ten years	0
Due after ten years	0
Fair value	517	649
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available for sale, amortized cost [Abstract]
Without single maturity date	291,874
Amortized cost	291,874	255,969
Available for sale, fair value [Abstract]
Without single maturity date	295,245
Fair value	295,245	250,819
Held-to-maturity, amortized cost [Abstract]
Without single maturity date	0
Held-to-maturity, fair value [Abstract]
Without single maturity date	0
Other Debt Obligations [Member]
Available for sale, amortized cost [Abstract]
Without single maturity date	31,418
Amortized cost	31,418	507
Available for sale, fair value [Abstract]
Without single maturity date	31,142
Fair value	31,142	$ 501
Held-to-maturity, amortized cost [Abstract]
Without single maturity date	0
Held-to-maturity, fair value [Abstract]
Without single maturity date	$ 0

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